Packaging

I think that zeronet can be packaged via setuptools and uploaded to PyPI instead of using custom update scripts. You will only need to create setup.py file.

Pros:
- Official way to install python packages
- Easier to install (pip install zeronet, dependencies are downloaded automagically)
- Easier to update (pip install --upgrade zeronet)
- [Command line scripts](https://python-packaging.readthedocs.org/en/latest/command-line-scripts.html)

Cons:
- Some modifications to source code (mostly imports) may be required

If you think that such modifications can be useful, i can work on this issue and create PR later.

Start by reviewing the existing custom update scripts and the source imports to determine what setup.py must cover. Done means ZeroNet can be installed with pip, dependencies are handled automatically, and the command-line scripts work after packaging.

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